Engine.



No. 737,609. PATENTED SEPT. 1, 1903. A. F. HALL.

ENGINE.

APPLICATION FILED JULY 21,1902.

'no MODEL, s SHEETS-SHEET 1.

Win00 W 02 j (1% y gjyw ma uonms PETERS'CO', PHOTD-LITHO. WASHINGTON n cNo. 737,609. PATBNTED SEPT. l, 1903. A. F. HALL.

ENGINE. APPLICATION FILED JULY 21, 1902.

N0 MODEL.

ah beaaoo k g No. 737,609. PATENTED sEPi'r. 1, 1903.

A; F. HALL.

ENGINE.

APPLICATION FILED JULY 21, 1902. no MODEL. 3 SHBETSSHBET s f5 mum 7. L7. 055,10. rg 5 {J F1 UNTTED STATES Patented September 1, 1903.

PATENT OFFICE.

ALBERT F. HALL, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE GEO. F.

BLAKE MANUFACTURING COMPANY, OF NElV YORK, N. Y., A CORPORA- TION OFNEYV JERSEY.

ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 737,609, datedSeptember 1, 1903.

Application filed July 21, 1902.

T0 on whom, it 727,603,! concern:

Be it known that I, ALBERT FRANCIS HALL, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented an Improvement in Engines, of which the following is aspecification.

My invention relates to the class of engines applicable for actuatingfluid-pum ps in which the main slide-valve is operated by an auxiliarypiston. This auxiliary piston is connected with the slide-valve in sucha manner that the valve will be moved by the reciproeating movementimparted to the auxiliary piston.

My present invention is an improvement upon the device shown anddescribed in Letters Patent granted to me September 22,1896, No.567,978; and the object of my invention is to simplify the construction,to dispense with numerous ports, with the rocking of the auxiliarypiston, and the devices for effecting such movement, and to cause theengine in its construction and operation to fulfil all requirements.

In carrying out my invention I provide an auxiliary piston coacting withand moving the main slide-valve, and the piston is hollow and performsthe additional function of anexhaust-port. lhisauxiliarypistonmoves in asteam-chest and has a flatouter seat perforated with one or moreexhaust-ports and with ports for steam to the respective ends thereof.An auxiliary valve lies upon and is held against the flat seat of theauxiliary piston upon the valve-rod by which the same is moved over theseat of the auxiliary piston, while the latter with its seat moves underor beneath the auxiliary valve to cover and uncover the steanrports andto arrest or cut oif the exhaust at the desired moment, and so produce acushion at the ends of the respective movements or strokes of theauxiliary piston.

'The details of the structure are hereinafter more particularlydescribed.

In the drawings, Figure l is a vertical section and partial elevationrepresenting my improvements. Fig. 2 is an elevation of thesteam-cylinder and the valve-seat thereof.

Serial No. 116.3l2. (No model.)

Fig. 3 is aside elevation of the main slidecross section of theauxiliary piston at y y of Fig. 6 and a section of the auxiliary valve,together with an elevation of the valve-rod as connected to theauxiliary valve. Fig. 8 is Fig. 5 is a vertical an elevation of theauxiliary valve alone, and i Fig. 9 an edge view of the same. Figs. 10and 11 are diagrammatic views in which the fiat outer surface of theauxiliary piston upon which the auxiliary valve bears is shown with itssteam and exhaust ports and a section of the auxiliary valve indifferent positions, so as to indicate the movements of the parts. Figs.5 to 11, inclusive, are upon the same scale and are of exaggerated sizein relation to the preceding figures for the purpose of clearness.

The steam-cylinder a, piston 19, and pistonrod b may be of ordinary orwell-known constructiou, and the piston-rod b, which in Fig.- 1 is shownas broken off, may extend to a pump cylinder. A bracket 0 is secured toone side of the steam-cylinder, and d represents a rocker-arm which ispivoted to the lower free end of the bracket 0 and at one end pivotallyconnected to a link d, which link is in turn pivoted to a head securedto the piston-rod b and which head moves with the movement of the pistonand piston-rod to move the link d and to swing the rocker-arm (1 uponits pivotal connection with the bracket 0.

6 represents the valve-rod, and e an auxiliary valve-rod pivotallyconnected thereto and upon which auxiliary valve-rod there are securedcollars 1. Upon the auxiliary valvered and between these collars thereis a mov- 5 the auxiliary valve-rod e and longitudinally of said rod andinto engagement with either one or the other of the collars 1, so as toimpart to the auxiliary rod e and the valve-rod 6 reciprocatingmovements in opposite directions.

The steam-chestf is secured in any wellknown manner to thesteam-cylinder a, preferably by bolts passing through lugs of thesteam-chest into lugs of the steam-cylinder. The steam-chestfispreferably provided with stuffing-boxes orguide-sleevesf,and throughthese and through packings 10, formed in connection therewith, thevalve-rod 6 passes. The steam-cylinder a is provided with steaminletports 2 3. These are preferably arranged almost in line, (see Fig. 2,)opening at one end through the "alve-seat of the steamcylinder and at.the opposite ends into the ends ofthe steam-cylinder, and there areexhaust-ports 4 5 6, which are in the valve-seat of the steam-cylinder,the central port 6 passing to the discharge for the exhaust and theports 4 and 5 passing through the cylinder and opening near therespective ends thereof and preferably upon opposite sides of thesteam-ports. The exhaust-ports 4 and 5 are purposely not continued tothe extreme ends of the steam-cylinder with the object of cutting citthe exhaust near the respective ends of the stroke of the piston, so asto cause the piston to slightly cushion at its extreme movements.

The steam-chest f is made with parts 7 8, forming guides for oppositesurfaces of the main slide-valve g, the flat face of which moves overthe flat valve-seat of the steamcylindera. This main slide-valve is verysimilar in form to that shown and described in my Letters Patenthereinbefore enumerated, the same being formed with a semicylindricalouter face and with a recess in the flat opposite face or back of thevalve, said valve being held in position between the parts 7 and 8 ofthe steam-chest and the fiat valveseat of the steam-cylinder. Thesteam-chest fhas a main cylindrical aperture and a central opening inthe end covered by a cap-plate 9, secured thereto. In the lower portionof the steam-chestf there is an exhaust-steam chamber 11 and apassage-way 12 to the same from Within the steam-chest and a port 20from the same connecting with a port 21, leading to the exhaust 6 of thesteam-cylinder.

h represents the auxiliary piston, which is made hollow and performs theadditional function of an exhaust-port. This piston is fitted to slidein the steam-chest, is provided Figs. 6 and 7,) and one or more facialexhaust-ports 15, extending to the interior of the auxiliary piston. Theauxiliary piston is also provided with an exhaust-port 16, passingthrough'the lower portion and connecting with the port 12 of thesteam-chest. I provide an auxiliary valve i with a flat recessed faceadapted to lie upon the seat of the auxiliary piston h. This auxiliaryvalve is recessed in its outer face longitudinally and alsotransversely. The transverse recess or recesses receive the valve-rod eand the longitudinal recess a locking-block 17, through which thevalve-rod passes, said lockingblock and the valve-rod 6 being connectedby a cotter-pin 18. With this form of connection it will be apparentthat the valverod 6 is securely held to the auxiliary valve 1' and saidvalve 2' held betweenthe valveseat of the auxiliary piston 71. and saidvalverod, so that there cannot be any slip lengthwise of the valve-rodor transverse thereof between the parts. These parts, however, are veryreadily disconnected after the removal of the face-plate 9 by taking outthe cotter-pin 18 and first removing the valverod 6 and then thelocking-block 17., In this device the movement of the piston 17 andpiston-rod b and the movement of the rockerarm at and the rods 6 ethereby cause a vertical movement of the auxiliary valve 11 in thesteam-chest with the vertical movement of the valve-rod 0. This movementpermits steam to pass from within the steam-chest alternately throughthe steam-ports 13 14 to the respective ends of the auxiliary piston h,so as to move the same first in one direction and then in the other andwith this movement to automatically move the main slidevalve 9 so as inone position to permit the steam to enter the port 2 and pass to one endof the steam-cylinder and in the other position permit the steam to passthrough the steam-port 3 to the opposite end of the cylinder and efiectthe reciprocating movement of the piston Z) and piston-rod b.. Theauxiliary piston h is the sole device for auto matically efiecting themovement of the main slide-valve g, and when the steam passes throughthe port 2 of the steam-cylinder to move the piston from the upper tothe lower end, as shown-in the drawings, the main slide-valve is soplaced upon the valveseat of the steam-cylinder that the port 3 iscovered and the exhaust is by the port 4 to the port 6 through therecess of the valve, the port 5 being opened for the passage of steamafter the piston moves past its opening into the steam-cylinder, andwhen the position of the valve is reversed steam passes through the port3 and'almost simultaneously through the port 4. The steam-port 2 iscovered, and the exhaust is by the port 5 into the port 6 by the recessin the valve. In the movement of the auxiliary piston and the auxiliaryvalve the latter is moved by the piston-rod 6 over the seat of theauxtoo ITO

iliary piston, and by the action of the steam the auxiliary-piston ismoved transversely, or, in other words, at right angles to the move mentof the valve-rod 6, its valveseat moving beneath the auxiliary valve, sothat while the auxiliary valve has its effect in covering and uncoveringthe ports the movement of the auxiliary piston also has its effect incovering and uncovering the ports and providing progressively for theexhaust and for the confining of steam at the respective ends of saidpiston. Figs. 7 and 10 show illustrativelya medium or midway position ofthe auxiliary valve with reference to the auxiliary piston. In theseViews steam is sup posed to be passing through the steam-port 14 to theleft-hand end of the auxiliary piston and to be moving said auxiliarypiston, as well as the main slide-valve, in the direction of the arrow,Fig. 10. The steam from the opposite or right-hand end of the auxiliarypiston is exhausting by the port 13 into the ports 15 to the interior ofthe hollow auxiliary piston It by the port 16 and the port 12,exhaust-chamber 11, and ports 20 and 21 to the port 6 of thesteam-cylinder. Referring to Fig. 10, and with the further movement tothe right of the auxiliary piston h the same passes beneath or underrunsthe auxiliary valve 2', so as to close ofi the entrance to the port 13.This happens before the extreme movement to the right of the auxiliarypiston, and at this moment the steam is confined in the end of thesteam-chest. From this latter position, and referring to Fig. 11, theanxiliary valve has moved from the position Fig. 10, the steam-port 13has been uncovered, and the steam-port 14 covered. so that steam passesby the port 13 into the righthand end of the steam-chest to move theauxiliary piston 7t toward the left and in the direction of the arrow,Fig. 11, the exhaust being then by the port 14 into the recess of thevalve and through the ports 15 within the hollow auxiliary piston, andso by the ports 16, 12, 11, 20, and 21 to 6, as hereinbefore described.With the movement from the left of the auxiliary piston it into theposition shown exactly in Fig. 11, the said auxiliary piston has passedbeneath or underrun the auxiliary valve, so that the aperture of theport 14 is closed, and in this position the steam is confined in theleft-hand side of the steam-chest against the left-hand end of theauxiliary piston prior to the parts shifting to repeat the movementshereinhefore described.

In the engine of my improvement the respective parts are not onlybrought into a coacting relation, but the movement of the auxiliaryvalve is positively effected by the valverod from the piston-rod, andthe movement of the auxiliary piston is directly effected through thismovement by the steam simultaneously with the movement of the mainslide-valve and the passage of steam into the steam-cylinder to effectthe operation of the piston and piston-rod.

The structure is exceedingly simple and not in any respect complex. Itsmovements are positive and etlicient. The engine, generally speaking, isadapted for any use, but is especially employed by me for actuatingfluidpumps.

I claim as my invention 1. In an engine, the combination with thesteam-cylinder, piston and piston-rod, and the steam-chest, ofa mainslide-valve, an auxiliary piston for actuating the slide-valve and anauxiliary valve coacting with the auxiliary piston and devices forpositively moving the auxiliary valve with the movement of thepiston-rod, and at right angles to the movement of the auxiliary piston,substantially as set forth.

2. In an engine, the combination with the steam-cylinder, piston andpiston-rod and the steam-chest, of a main slide-valve,an auxiliary"piston coacting with the main slidevalve and for positively moving thesame in unison therewith, an auxiliary valve coacting with the auxiliarypiston and moving over a seat of said auxiliary piston, and means forimparting to the auxiliary valve a movement in one direction which is atright angles to the movement imparted by the steam to the auxiliarypiston, substantially as set forth.

In an engine, the combination with a steam cylinder, a steam chestconnected therewith, a piston and piston-rod, of a main slide-valve foradmitting steam to the cylinder and for providing a path for theexhaust, an auxiliary piston in part receiving and c0- acting with themain slide-valve and having a movement in the same direction as the mainslide-valve and at right angles to the line of movement of thepiston-rod, an auxiliary valve coacting with the auxiliary piston andhaving a movement in the same direction as the piston and at rightangles to the movement of the auxiliary piston, said movement beingacross a seat of the auxiliary piston, a valve-rod to which theauxiliary valve is connected, and means for effecting the movement ofthe valve and valverod in unison with and by the reciprocating movementof the piston-rod, substantially as set forth.

4. In an engine, the combination with a steam -cylinder having steam andexhaust ports, a piston and piston-rod, of a steamchest having a mainaperture circular at its ends, and a surface-aperture and a cap-platecovering the same and internally having parts forming guides at oppositesides, a main slide-valve having parts resting against and the movementof which is directed by said guides and having an outer surface ofsubstantiallysemicircular form, an auxiliarypiston hollow and having arecess receiving and engaging the curved part of the main slidevalve andhaving an outer valve-seat with ports therein, an auxiliary valve lyingupon the valve-seat of the said auxiliary piston and in the outeraperture of the steam-chest, a

valve-rod movable longitudinally through the steam-chest and to whichthe auxiliary valve, is connected, and means actuated by the movement ofthe piston for simultaneously imparting a movement to the auxiliaryvalve across the seat of the auxiliary piston to admit steam to theports thereof so as to impart to the auxiliary piston and the mainslidevalve reciprocating movements at right angles to the movement ofthe auxiliary valve, substantially as set forth.

5. In an engine, the combination with the steam-cylinder having ports, apiston and piston-rod and a main-slide-valve, of a steam chest receivingthe main slide-valve and having internal recesses at its ends and havingan exhaust-chamber 11 and passage-ways 12 and 20 from the interior ofthe steam-chest to said exhaust-chamber and from said exhaust-chamber tothe exhaust of the steamcylinder, an auxiliary piston hollow and havinga port 16 connecting the hollow interior with the said ports 11 and 12and said auxiliary piston coacting with the main slidevalve, and anauxiliary valve coacting and contacting with the said auxiliary piston,and a valve-rod to which said auxiliary valve is connected, and meansfor imparting a vertical movement to the auxiliary valve, substantiallyas set forth.

6. In an engine, the combination with the steam-cylinder having ports, apiston and piston-rod and a main slide-valve, of a steamchest receivingthe main slide-valve and havinginternal recesses at its ends and havingan exhaust-chamber 11 and passage-ways from the interior of thesteam-chest to said exhaustchamber and from said exhaust-chamber to theexhaust of the steam-cylinder, an auxiliary piston hollow and having aport 16 connecting the hollow interior with said passageways and saidauxiliary piston coacting with the main slide-valve and having an outervalve-seat and steam-ports l3 and 14 therein and running longitudinallyof the said auxiliary piston, and one or more exhaust-ports 15 throughsaid outer seat connecting with the hollow interior, and an auxiliaryvalve lying upon and contactingwith the outer valve-seat of theauxiliary piston and having a recessed inner surface to provide for thepassage of the exhaust-steam, a valve-rod to which the said auxiliaryvalve is secured, and means for imparting a movement to said auxiliaryvalve across the seat of the auxiliary piston so as to alternatelyuncover the steamports and provide for the exhaust and by thesteam-pressure impart to said auxiliary piston longitudinalreciprocating movements at right angles to the movement of the auxiliaryvalve, substantially as set forth.

7. In an engine, the combination with the steam-cylinder, a steam-chestand a main slide-valve, of an auxiliary piston engaging and coactingwith the main slide-valve, an auxiliary valve contacting and coactingwith the auxiliary piston, said auxiliary valve having in its outer facelongitudinal and transverse recesses, a valve-rod lying in the transverse recesses ofsaid auxiliary valve, a lock-' ing-block lying in thelongitudinal recess of said valve and a cotter-pin or equivalent deviceconnecting the valve-rod with the locking-block and suitable guides forthe valverod in the steam-chest, substantially as set forth.

8. In an engine, the combination with the steam-cylinder, piston,piston-rod and the steam-chest, of a main slide-valve, an auxil:

iary piston for actuating the slide-valve, andan auxiliary valvecoacting with the auxiliary piston and ports arranged in the auxiliarypiston and controlled by the position of the auxiliary valve, so thatthe exhaust is closed to the respective ends of the auxiliary pistonbefore the same reaches the limit of its stroke in either direction toconfine the steam, substantially as set forth.

9. In an engine, the combination with the steam-cylinder, piston andpiston-rod, and the steam-chest, of a main slide-valve, an auxiliarypiston for actuating the slide-valve, steam-ports running through theauxiliary piston from the ends thereof and terminating in adjacentapertures in a seat of said piston, and exhaust-ports also adjacent tosaid steamports and an auxiliary valve coacting with the auxiliarypiston, which ports are controlled by the position of the auxiliaryvalve so that the escape of the exhaust-steam is cut off and theauxiliarypiston caused to cushion thereon at the ends of its respectivestrokes, substantially asset forth.

. Signed by me this 10th day of July, 1902.

ALBERT F. HALL.

Witnesses:

JAMES H. SHEDD, ALICE M. GEE.

